I read a solution for chevy impala's that heater only blow out hot air when driving and cool air blows when sitting at red light and/or in idle position. A solution was given but I dont understand the abbreviations - "CK FOR VAC LEAKING TO TEMP BLEND DOOR". Please spell out the words so that I can understand.
Thank you.
CK FOR VAC LEAKING TO TEMP BLEND DOOR
Hello my Impala does the same thing. You need to check for a Vacuum leak basically. Temp Blend Door does not make a whole lot of sense. So I cannot go into depth but it seems like a hose is leaking.
SOURCE: 2001 Dodge Caravan heater blows cold air when stopped
Have you checked the coolant level? What you describe is exactly what happens if the coolant level is low. When stopped at idle, hot coolant is not circulating through the heater core, so no heat. As the engine increases in rpm's when you pull away from the light, the water pump is spinning quicker, and some coolant is making it to the heater core. So check the level, and if it is low, keep an eye on it to see if it drops again. That of course indicates a leak somewhere. Get it fixed, as overheating the engine leads to costly repairs and worse case a new engine. Let me know how you make out with this.
Testimonial: "Thanks Curt! You were right ON!"
HEATER NOT
BLOWING COLD,NO HOT AIR FROM HEATER,A/C BLOWS HOT AIR,A/C NOT BLOWING COLD,
COLD AIR FROM HEATER,BLEND DOOR ACUTATOR CLOSED,HVAC UNIT NOT OPERATING,
http://alltypesofpartsreplacing.blogspot.com/2012/12/heater-not-blowing-coldno-hot-air-from.html
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